Pipe wrench having a holding plate for a rockably mounted traveling outer jaw



June 1965 YOSHINORI MATSUOKA 3,

PIPE WRENCH HAVING A HOLDING PLATE A ROCKABLY MOUNTED TRAVEL OUTER FiledDec. 196s INVENTOR Yawn/0m Am 75. 0am UM-5 A m ATTORNEY United StatesPatent 3,188,894 PIPE WRENCH HAVING A HOLDING PLATE FOR 118A I E OCKABLYMOUNTED TRAVELiNG OUTER Yoshinori Matsuoka, Osaka, Japan, assignor toT0110 Koki Kabushiki Kaisha, Osaka, Japan Filed Dec. 27, 1963, Ser. No.333,805 Claims priority, application Japan, Aug. 30, 1953, 38/64,822;Sept. 7, 1963, 38/68,115); Sept. 14, 1963, 38/69,491, 38/459,492

1 Claim. (Cl. 81-101) The present invention relates to a pipe wrench.

One object of the present invention is to provide a pipe wrench soconstructed as to have a holding plate, which holds a movable jaw whichwill not slip out of a longitudinal slot provided on the back of astationary jaw member.

Another object of the present invention is to provide a pipe wrench soconstructed as to have a holding plate, which holds a movable jawwherein the rocking movement of the movable jaw is free within saidlongitudinal slot of the stationary jaw member.

Still another object of the present invention is to provide a pipewrench equipped with a sliding plate so constructed as to engage amovable jaw slidable in said longitudinal slot. A further object of thepresent invention is to provide a pipe wrench in which the opposinggripping teeth are made of a hardened metal alloy of a strengthconsiderably greater than conventional steel.

A further object of the present invention is to provide a pipe wrench inwhich the gripping force of the wrench is significantly increased byhaving one or a plurality of longitudinal grooves provided additionallyon the conventional gripping teeth in a lateral direction with definitespacings.

Another object of the present invention is to supply a pipe wrench inwhich the opposing gripping teeth are formed with numerous projectionsof pyramid-like shape, whereby the gripping force of the wrench againstthe surface of a pipe is increased, completely preventing the grippingteeth from slipping on the surface of pipe.

In consideration of the above objects and other objects that may bedescribed hereinafter, the arrangement of the parts of the pipe wrenchaccording to the present invention will be described in the followingspecification and in the accompanying claim hereof.

In the accompanying drawings illustrating an embodiment according to thepresent invention:

FIG. 1 is the front view of the pipe wrench according to the presentinvention, partly sectioned;

FIG. 2, the bottom plan view thereof;

:FIG. 3, a longitudinal section through line III-III of FIG. 1;

FIG. 4, a perspective view of the holding plate of the pipe wrenchaccording to the present invention, and

FIGS. 5 and 6 are front views, respectively, of the gripping teeth ofdifferent types.

Referring now in detail to the present invent-ion with reference to theaccompanying drawings, an idling slot 6 is provided in the central wallof a U shaped holding plate 5 displaceably fitted in the threadedportion 4 of the movable jaw 3, which is inserted through along-itudinal slot 2 provided on the back of the stationary 3,188,894-Patented June 15, 1965 jaw member 1. The holding plate 5 is held to theside Wall of the longitudinal slot 2 by a projection 8 of a screw 7secured to the side wall of the stationary jaw member 1 and extendingthrough the .slot 6 of the holding plate. The jaw portion 9 of thestationary jaw member 1 has a toothed plate or grasping member 12 madeof a hardened metal alloy steel and rigidly fitted to a base 11 in aframe 10 with 3 or 4 side edges. The gripping teeth of the toothed plate12 is constituted of numerous projections 13 of pyramid-like shape, asshown in FIG. 5 or with divided edges 15 formed by a plurality ofparallel vertical grooves 14 cut on a plate provided with numerousparallel teeth, as shown in FIG. 6.

The movable jaw 3 also has a toothed plate 16 also of hardened metalalloy.

In the drawings, numerals 17, 17 indicate springs biasing the upper andlower walls of said holding plate 5 and which are received in holes 18,18' bored angularly in front and rear in the upper and lower portionsadjacent the longitudinal slot 2. Numeral 19 indicates a screw foradjusting the tension of said spring 17.

Describing the operation of the pipe wrench according to the presentinvention the movable jaw 3, inserted through the longitudinal slot 2bored in the stationary jaw member 1, has the U-shaped holding plate 5pivotally held on a projection 8 of the screw 7 projecting into saididling slot 6 of suitable shape in the central wall thereof, the holdingplate 5 being restricted from lateral movement by said projection 8 andthereby prevented from falling out, and also the holding plate havinglight play between the idling hole 6 and the projection 8 of the screw 7as its pivot, thus enabling it to grip or release the movable jaw member3 by the front end or the rear end thereof.

According to the present invention, the toothed plate 12 made of ahardened metal alloy is rigidly fitted to the base 11 in a frame withthree or four side edges in the jaw 9 of the stationary jaw 1. Theaffixing of the toothed plate can be performed in a simple manner. Thetoothed plate 1 2, as shown in FIGS. 5 and 6, is provided with numerousprojections 13 of pyramid-like shape, so-called diamond cuts, or dividededges 15 made by having one .or a plurality of vertical grooves cut onhorizontal edges in parallel, whereby the grip of the teeth on the pipebecomes firm, and thereby the wrench is prevented from horizontalslipping and in addition, the teeth being made of a hardened metal alloysteel, the pipe Wrench according to the present invention is free fromthe abrasion of the teeth and can be used permanently without affectingits Working condition.

According to the present invention, the pipe wrench being constructed asdescribed above, the gripping and turning of pipe can be performedsmoothly, and in addition the gripping teeth being made of a hardenedmetal alloy on both jaws of the wrench, the durability thereof and itscommercial value are greatly increased.

What is claimed:

A pipe wrench comprising a stationary jaw member having a guide channeldefined by upper, lower and side walls and provided with bores extendinginto said stationary jaw through said upper and lower walls, .a guidescrew secured to one of said side walls and extending inwardly of saidchannel, a holding plate in said channel, said holding plate beingformed with in-bent flanges and'an idling slot said-screwhe ing looselyreceived in P References Cited by'the Examiner d dl n ot, a mova e jawhaving a t r de sha k UNITED STATES PATENTS" displaceable in saidholding plate between said inben-t 838 552 12/06 L d a 1 portions, 21pair of spiral springs received in each of said 1 70112O 2/29 5; boresrespectively, for biasing the respective flanges of 5 8/50 i g 81-186said holding plate, an adjusting screw in one of said V 2,680,396 6/54Wright 81-101 bores for ad usting the tension of one of said springs2760 ,8/56 St Pierre and a pair of toothed grasping members secured toeach of said jaws respectively for engaging the outer surface WILLIAM Fprlmary Exammerof a pipe. MILTON s. MEI-IR; Examiner. I

